scholarly journals Effect of CaO and Hot Rolling on the High Temperature Oxidation of Magnesium Alloys

2012 ◽  
Vol 45 (4) ◽  
pp. 155-161
Author(s):  
Chunyu Xu ◽  
Trinh Van Trung ◽  
Sung-Bin Won ◽  
Dong-Bok Lee
Keyword(s):  
High Temperature ◽  
Magnesium Alloys ◽  
Hot Rolling ◽  
High Temperature Oxidation ◽  
Temperature Oxidation

Carbide Fragmentation and Dissolution in a High-Carbon High-Chromium Steel Using Hot Rolling Process: Microstructure Evolution, Wear, High-Temperature Oxidation, and Chloride-Induced Corrosion Properties

CORROSION ◽  
10.5006/2749 ◽  
2018 ◽  
Vol 74 (9) ◽  
pp. 958-970 ◽  
Author(s):  
Majid Shahsanaei ◽  
Sadegh Pour-Ali ◽  
Ali-Reza Kiani-Rashid ◽  
Sannakaisa Virtanen
Keyword(s):  
High Temperature ◽  
Corrosion Behavior ◽  
Hot Rolling ◽  
High Temperature Oxidation ◽  
Rolling Process ◽  
High Carbon ◽  
Corrosion Properties ◽  
Temperature Oxidation ◽  
High Chromium ◽  
Hot Rolling Process

A series of hot rolling processes with different reduction percentages (10%, 30%, and 50%) were applied to a high-carbon high-chromium tool steel (2HCTS). Microstructural evolutions, wear behavior, high-temperature oxidation, and aqueous corrosion properties were investigated. The results revealed the breakage and dissolution of primary carbides and a uniform carbide distribution after the hot rolling process. It was proposed that the presence of higher amounts of dissolved chromium in the hot rolled samples leads to the formation of Cr-rich oxides with more protection and less porosity at high temperatures, as well as an improved corrosion behavior in 3.5 wt% NaCl solution. This improvement in the corrosion behavior is not at the expense of the degradation of wear resistance. Probable mechanisms for carbides dissolution are also discussed.

The effect of the existing state of Y on high temperature oxidation properties of magnesium alloys

2016 ◽  
Vol 370 ◽  
pp. 357-363 ◽  
Author(s):  
Xiaowen Yu ◽  
Shijun Shen ◽  
Bin Jiang ◽  
Zhongtao Jiang ◽  
Hong Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Magnesium Alloys ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Properties

Effect of Si on High-Temperature Oxidation of Steel during Hot Rolling

2008 ◽  
Vol 273-276 ◽  
pp. 655-660 ◽  
Author(s):  
Lucia Suarez ◽  
Juergen Schneider ◽  
Yvan Houbaert
Keyword(s):  
High Temperature ◽  
Hot Rolling ◽  
High Temperature Oxidation ◽  
Surface Defects ◽  
Steel Strip ◽  
Surface Oxidation ◽  
Strip Surface ◽  
Temperature Oxidation ◽  
Scale Properties ◽  
Specific Oxidation

An oxide scale layer always forms at the strip surface during the hot rolling process. As a consequence, de-scaling and pickling operations must be performed prior or after hot rolling. Many surface defects caused by hot rolling are related to oxidation in the reheating furnace. One of these is the melting of eutectic FeO/Fe2SiO4 during reheating over 1170°C giving as a result red scale defects in Si-added steel. On the other hand, steel strip surface oxidation during hot rolling causes an industrial and environmental problem: secondary oxide is removed after roughing, but tertiary oxide scales already start to form before entering the finishing stands. Their properties affect the final steel surface quality and its response to further processing. Furthermore, the addition of alloying elements has an important impact on scale properties. In particular the alloying of silicon effects the region between scale and substrate. It causes peculiar surface properties inherited from its specific oxidation characteristics. Conventional oxidation experiments in air of silicon steels are a valuable tool to study the influence of Si on steel oxidation. After oxidation in air in the temperature range of 900-1250°C it has been observed that Si enhance markedly scale adhesion, especially above 1177°C (the eutectic temperature of FeO-Fe2SiO4 ) and also at lower temperatures. Special attention has been paid on the investigation of the effects of alloying Si on the high-temperature oxidation of steel, for a better understanding of the behaviour of modern steels during hot rolling.

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